CHEMCO Exit Exam • Set 1 Question 15 of 30

What is mandatory prior to personnel entering a chemical cargo tank for inspection?

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Direct Answer

Option C: Tank gas-freeing, atmospheric testing for O2 (20.9%), toxic gas (0 ppm), LEL (0%), and Enclosed Space Entry Permit

Safe entry into enclosed spaces like cargo tanks requires rigorous procedures: gas-freeing, atmospheric testing (O2, LEL, toxics), and an official Enclosed Space Entry Permit, as mandated by SOLAS and ISGOTT.

All Options

Washing with seawater

Verbal permission from cook

Tank gas-freeing, atmospheric testing for O2 (20.9%), toxic gas (0 ppm), LEL (0%), and Enclosed Space Entry Permit (Correct Answer)

Opening main valve

Detailed Explanation & Context

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Chemical Tanker Cargo Operations (CHEMCO).

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More Questions in CHEMCO Set 1

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Q1 Which IMO Code regulates the carriage of dangerous chemicals in bulk on chemical tankers? Q2 Under MARPOL Annex II, which pollution category presents the major hazard to human health or marine resources? Q3 What test is performed on tank bulkhead surfaces to detect microscopic hydrocarbon residues before loading sensitive chemical cargoes? Q4 What type of chemical tanker skin/tank construction is required for carrying high-hazard cargoes like Isocyanates? Q5 What material is widely used for cargo tanks carrying aggressive acids such as Nitric or Phosphoric acid? Q6 What is the key limitation of Zinc Silicate tank coatings in chemical tankers? Q7 What document must be maintained on board detailing all chemical cargo loading, discharging, tank washing, and slop handling? Q8 What is self-polymerization in chemical cargoes? Q9 What mandatory document provides chemical property, health hazard, reactivity, and emergency response data for a chemical cargo? Q10 What system is used to purge chemical lines and maintain an inert nitrogen cushion over moisture-sensitive cargoes?